Basic CS-Operating System [3i Infotech Placement]: Sample Questions 33 - 35 of 89

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Question 33

Operating System
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Describe in Detail

Essay▾

What has triggered the need for multitasking in PCs?

Explanation

Define Multitasking
  • Multitasking is allowing set to perform more than one computer task at a time.
  • Growth of client server computing is the main driver for multitasking- a server necessarlily must support multiple clients.
  • Modern computing requirements like use of cloud computing, backend processing, web servers etc. are driving this further.
  • Ever-increasing computing power with support for multiple cores/threads, support for virtual memory, increased speed and memory capacity of microprocessors are primary hardware changes supporting growth of multitasking.

Question 34

Operating System
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Write in Short

Short Answer▾

What are the sub-components of I/O manager in Windows NT?

Explanation

  • Network redirector/server
  • Cache systems
  • File systems
  • Network driver
  • Device driver

Question 35

Operating System
Edit

Describe in Detail

Essay▾

What are the four layers that Windows NT has in order to archive independence?

Explanation

Hardware Abstraction Layer

Understanding of Hardware Abstraction Layer
  • HAL or hardware abstraction layer is the logical abstraction between physical hardware and software.
  • Provides a device driver interface allowing communication with hardware.
  • Main purpose is to connect different hardware to the OS- system peripherals.

Kernel

Define Structure of Kernel
  • The central part of an operating system.
  • Manages main aspects like RAM, memory, CPU scheduling, security etc.
  • Manages communication between the software and the hardware.

Main Tasks of the Kernel

  • Process management
  • Device management
  • Memory management
  • Interrupt handling
  • I/O communication
  • File system

Subsystems

  • The protected subsystems act as mediators between the user-level application and the NT executive.
  • Subsystem allows NT to provide each process a container virtualizing the operating system.
  • Every application runs only in the subsystem for which it was designed- sub-system is determined at launch of application in Windows NT

System Services

Operating System Services
  • System supplies different kinds of services to both the user and the programs.
  • Provides application programs an environment to execute.

Common Program Services

  • User interface
  • Program execution runtime
  • Input/output operations
  • Communication.
  • Error detection
  • Accounting
  • Security and protection

Common User Services

  • Authentication
  • Program execution
  • Protection

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